Looking at it from the front, in the s4, which board is which chain?
One of my original B2 s4's is acting up and finally failed in a manner that kept the controller/GUI accessible. Says that chain 3 is all ----------
Cheers!
Someone made a text diagram early on in this thread but I can't find it, and my S4 is probably different to most as it was an early one. The dead board might be highlighted by no LED activity though, worth a look.
Tried that. At least for the versions that used PCIe power connectors like this one, there are no LED's on the boards. There *is* a row of very tiny ones on the controller board that could serve the same functions but is no way these eyes can see what they are labeled.
As usual after it has gone down, after a power down and short rest it again came back up at full speed. The 2 other times it went down the controller was dead - no lan plug lights, no blinking CPU light, no red light.
To cover other questions, all fans are fine, free spinning, no axial play to the blades. Temps 55-59c (room is 90F). Psu light is green.